U.S. women increasingly use pot during pregnancy, study finds

U.S. women are increasingly using marijuana during pregnancy, sometimes to treat morning sickness, new reports suggest. Though the actual numbers are small, the trend raises concerns because of evidence linking the drug with low birth weights and other problems.

In 2014, almost 4 percent of pregnant women said they'd recently used marijuana, up from 2.4 percent in 2002, according to an analysis of annual drug use surveys.

Dr. Nora Volkow, director of the National Institute on Drug Abuse, said the results raise concerns and urged doctors and other health care providers to avoid recommending the drug for pregnant women. Volkow commented in an editorial published online Monday with the study in the Journal of the American Medical Association.

A separate study in the same journal found that almost 10 percent of adult marijuana users in the United States — 3 million people — have used it at least partly for medical reasons; 20 percent of these users live in states where medical marijuana isn't legal.

Volkow noted that laws legalizing medical marijuana in 29 states and Washington, D.C. do not list pregnancy-related conditions among allowed uses. But the laws also don't prohibit that use and don't include warnings about possible harms to the fetus, she said.

Strong evidence of harms is limited, but besides low birth weights, newborns whose mothers used marijuana while pregnant may face increased risks for anemia and other problems requiring intensive care. Memory and attention problems also been found in older children whose moms used marijuana in pregnancy, Volkow noted.

How marijuana might lead to those problems is unclear but Volkow said one theory is that it might interfere with formation of nerve cells and circuits in the brain during fetal development.

The American College of Obstetricians and Gynecologists discourages marijuana use by women who are pregnant or breastfeeding.

Both studies analyzed data from annual U.S. government surveys on drug use that are based on participants' self-reporting.

One focused on 200,510 women of reproductive age who participated in the 2002-2014 surveys. Recent use — within the past month — among non-pregnant women also increased over those years, from about 6 percent to 9 percent, researchers from Columbia University Medical Center reported.

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